Look up Bob's Red Mill. I use their gluten free all-purpose flour as a binder in game sausage for a couple of my customers. It does have its own flavor though, so other things have to be juggled. Are you making a fresh or smoked sausage?

100% meat is gluten freeMost GF sausages would have either rice flour or soy flour or a comboIts there mainly as a cheap filler and it absorbs the fat as customers apparently dont like to see fat running out of a sausage